Wednesday, March 31, 2010

The expected date of delivery is normally 40 weeks from the last menstrual period (LMP) and childbirth usually occurs between 37 and 42 weeks. The actual pregnancy duration is typically 38 weeks after conception. Though pregnancy begins at conception it is more convenient to count from the first day of a woman's last menstrual period, or from the date of conception. More accurate and sophisticated algorithms take into account other variables, such as whether this is the first or subsequent child, ethnicity, parental age, length of menstrual cycle and menstrual regularity.

Shown above is a photo of pregnant woman expecting her second son by a brilliant photographer specializing in pregnancy photography.